Wireless signaling



PATENTED FEB. 16, 1904.

D. DRAWBAUGH. WIRELESS SIGNALING. APPLI OA TION FILED MAR. 1, 1902.RBNEWBD JULY 15, 1903.

3 SHEETS-SHEET 1.

NO MODEL.

No.752,533-. "PATENTED FEB. 16, 1904.

D; DRAWBAUGIL .WIRELESS SIGNALING.

APPLICATION FILED MAR. 1, 1902. RENEWED JULY 15, 1903.

110 MODEL. 3 SHEETSSHBET 2.

PATEN'IED FEB 16;;1904 D. DR 'VBAUGH. WIRELESS SIGNALING.

'- APPLIOATION FILED M5 P1. 1, 1902. RENEWED JULY 15, 1903.

' v 3 SHEETS-11351 3.

N0 MODEL.

' To all whom it Wtcty concern;

4, l This ist'he complete transmitter. The re Unirnn y PatentedTebruarY16, 1904.

WIRELESS SIGNALING-V" SPECIFICATION forming part of Letters Patent No.752,533, dated February 16, 1904. I Application filed March l, i902.Renewed ni 'ls, 190s. seen in; 165,660. mammal.)

Be it known that L'DANiEL DnAwBAUGn, a' cltizenwof the United States,residingat Eberlys Mills, in the county of Cumberland and' State ofPennsylvania, haveinvented certain new and useful Improvements in vireless Signaling, of which the following is'a specifi-- cation. 7

The invention is an apparatus for transmit-- ting intelligencethrough'the natural media.

The method disclosed formstlie subject-mat- 4 ter of my cope'ndingapplication, Serial No. 165,663.

To attain these ends the invention consists of a system of wirelesstelephony and telegraphy embodying novel features of construction andcombination of parts substantially as disclosed herein.

In the accompanying drawings, Figure 1 is a diagrammatical View ofmytelegraphy systems Fig. 2 isa similar view of mytelephony system. Fig.3 is a similar View of .a telegraphy system employing a, series ofstations.

Fig. 4 is a side elevation. of a magneto-gen.

erator and inducer employed in connection with my system. Fig, 5. is atoppla'n'view thereof with the upper portion of the'magnets removed orbroken away, the electricalconnections being shown in diagram. Fig. 6 isa section taken on line :0 .2? of Fig. 5.

Referring by numerals to the drawings, the numerall designates theground-plates ot' the transmitter, wlii'cha re placed in the ground deepenough to always be surrounded by some moisture and preferably forty;lift-y, or sixty feet apart. In the telegraphy system I. connect thewire 2 'tofa transmitting-key a wire 4 connecting the key; to themagneto-generator and inducer 5, which is also connected to the otherground by means of the wire 6.

5 ceiver consists of theground-plates 7 and 8, .NSlhlCh are sunken inthe earth about the same 5 eond iit'tor wire 9", "a

f di stanee as the plates of the transmitter; but,

strange to say, to make theapparatus operative} that signals may betransmitted the plate flapparcntly must be either in advance a in'e oftheplate 7, preferably the plate 7 .1 connect a feh connected to a reorbehind the l about Uf ILTOOL lay '10, a wire 11 connecting the r'elaytothe plate 8. Operated by the relay is the receiving instrument circuit12. This is .the complete receiver. I j 7 In order that signals may betransmitted, the magneto-generator is constantly revolved by means ofthe motor 13. thus impressing on the-wires 2 and 6, the plates 1, 7, and8, and thewires 9- and 11 acurrent which when broken by the key 3 causesthe relay to open and close the receiving-instrument circuit, andthus'cause signals to be obtained in the receiving instrument. n I

' The magneto-generator and inducer I will that 1 may pass on anddescribe the systems. In .Fig." 3 it 'will be observed that I employ asingle station in Which the magneto-generator is connected, the otherstations 1*, 15, and 16 having their transmittingcurrent furnished bythe magneto gen'erator in the station marked T, saidmagneto-generatorbeing constantly revolved to furnish a means whereby the Morse code maybe transmitted. i

' I will now pass to the'description of Fig. '2, wherein is shown mysystem of telephony. In

is ready for use connect the magneto-genera .tor 21 with the platesAdapted to be connected with the ground-plates at the prrmer time arethe wires22. whichare the conductors for the telephone.-transmi-tter 23,which includes; batteries and accessory ap mratus. The plates and-bothstations are installed substantially the same distances and in the samerelation to one another asin the telegraphv sysreceiver are employed;"l'heretorein the receiving-station l'haye the ground-plates 24: andthetelephone-receiver 25. connected therethe system of telephony,the-transmitteris cut out from the ground-plates.and thenwg'netogenerator is, placed in' connection with the grou'liil plates."The iiiagneto-generator is hnmvs-t-tin operation for ashort space oftime. 3 say twoor three minutes. \i'henit is cut from connection withthe ground-plates and the teleides'cribe more in detail hereinafter inorder a tem, except that thetelephone transmit tor and this I employ theground-platesl8 and the, wireSr19, each of-which'has' connected thprctothe swltches 20, which before the telephone to by i-ts conductor-wires26. When using phone-transmitter is placed in connection with phone canhe used and has been used every day for three weeks without againnecessitatingthe employment .ofthe magneto-gem erator and inducer. It isalso possible, and

I have the apparatus in operative condition,

for the tclephonertrainsmitter and telegraphtransmitter to be connecteddirectly at the same end of the line, at which time the key may l eclosed-as when receiving a message.

In igs. 4t, 5, and 6 I have illustrated in detail and on an enlargedscale mymagnetogenerator, which I claim makes my system of telephony andtelegraphy possible and which I have found can also e employed with anyof the various systems of wireless telegraphy now in use, in which casethe spark-coil and its circuitare dispensed with.

lBy experimenting I find that in telegraphi g it was possible to getresults with a Hertz scillator, the primary circuit of which had arapidly-operatingmake and break; but muchbetter and comparativelyentirely satisfactory results were attained by employing my special formof magneto. I also found that with the wires thirty feet in the air andthe other terminal in the ground at'bot-h stations-I obtained resultsfar superior to those obtained with the spark-coils now used and,furthermore, that all'the batteries were dispensed with. This particularsubject-matter has been canceled frorri this specification and is thesubject-mattier of two applications, Serial'Nos. 113,888 and 113,889,filed July 1, 1902. l The magneto-generator is constructed as fol lows:Upon the base 29 is mounted the two similar supporting-plates 30, whichare provided with the inner concavcd or curved walls 31. Supported bytheseplates, between the ends thereof, are the two circular disks 32,provided with the alined bearings 33 and the vertotheshaft.

tical arnis 34. Mounted revolubly in the bearings of the disks is theshaft '35, carrying the oppositclyarranged arms 36, around which arewound the coils 36', which are connected Carried by the arms outside ofthe "coils are the two long outwardly-curved plates 37, which areadapted to revolve with the shaft 35, the inner walls of thesupporting-plates through "the medium of the shaft .38 carrying thelarge gear 39, which meshes with the smaller gear 40 of the shaft 35. To

revolve the shaft 38, any motive power may be employed, but moreespecially a hi'gh-speed ends contacted upon the outer faces of thesupporting-plates are the two pairs of horseshoe-magnets 41 which areheld in the proper place by means of the tie-rod d2. Secured upon thebase is a rigid spring-oontzu-t plate 4.3, to which isconncctcd acontluc'tor-wire l3, passing through the base and being connected to thebindiiig-poststa, havingthcflatcontaetplate 45 on the upper face ofthcbasel This contact-plate hasits free end 43" in contact continuouslywith the inner end of the shaft Mounted upon the base is also the plate46, to which pivotally connected the vertical switch =17, which isadapted to engage the outer face of one of the permanent magnets.

post 52 and the vertical post or standard 53.

A flat spring 5* is adjustably held by the post 53 and is adapted tobeattractcd by the armature as it revolves to short-circuit the armatureand to break the circuit after the armature has reached its highest.point of potential. In the operation of this machine ithas hem foundthat as each one of the plates 37 passes below the spring-plate untilits central point is reached the spring-plate is not ali'ected, yrt justa short distance beyond that point or when the curved plate is leavingthe support,- ing-plate the free end of the spring-plate is caused todip and contact tlic surface of the |V curved plate, thus short-cirultmg the armm ture and causing a current 0 be transmitted to the earthplates when he short circuit breaks twice every full revolution.

In the operation of a' telegraph system my generator is constantlyrevolved. The faster it revolves the higher the potential; andconsequently the greater current for transmission of. signals. Bypressing upon the key in the transmitter and operating it in the sameway as in the wire telegraphs dots and dashes are readily transmittedand can 'be detected either in a microphone or a sounder very accuratelyand as speedily as with the present forms of tolegraph. In myexperiments I have telegraphed and received intelligent messages fromdistances from sixty-feet to ten miles, this being done at my home andbefore different parties. I would also say that I have used the receiverupon a small boat in a stream, the plates belng suspended in the waterat approximately the distance apart as on land, and until the positionof the plates were changed signals were received either by a sounder ormicrophone. This system may be also appliedto railwaycars, where'theground connections -may be made ,upon opposite rails by making aconnection with the axlesand wheels and by a small wheel carried uponthe endof .a long pole, which may run upon oneof the two tracks or athird to one side, but must be extended beyond the rear of the car,where the relative IIO positions may bekept. I In thissysteinI could Ithat the resistance thereof is reduced to'allow the transmission oflow-tension currents therethrough, this beingthe broad principle of myinvention. Y i v What I claim asnew, and desire to secure? by LettersPatent, is I 1. In a system'for the transniissionof intel iigencethrough the natural media, means for impressing on the media currents ofhigh po tential, in combination with-means for impressing on the mediacurrents modified in accordance with the signal to be transmitted.

2. In asystem for the transmission of intelligence through the naturalmedia, means for impressing on the media, intermittent currentsj of highpotential, in combination with means for impressing ontlie mediacurrents modified in accordance with the'signal to lie-transmitted. 1

3'; In a system for the transmission of intelligence. through thenatural media, means for impressing on the media alternating currents ofhigh potential in combination-with ,means for impressing on the mediacurrents'modified in accordance with the signal to be transmitted.

' 4. In a system for the transmission ofspeech through the naturalmedia, means for impress-- ing on the media currents of high potential,in combination with means for impressing on said media currents modifiedby and in accordance with sound-waves. v

5. In a system for the transmission of speech through the natural:media, means for impressing on the mediaintermittent currents of highpotential, in combinationwith means for im pressing on said mediacurrents modified by and in accordance with sound-waves. 6. In a systemfor the transmission of speech through the natural media, means forimpressing on the media alternating currents ofhigh potential,in'combination with means for 1mpressing on said media currents modifiedby and in accordance with sound-waves. v 7 In a system for thetransmission of intelligence through the natural media, means iorimpressing on the media currents of high potential,in combination withmeans for impressing on the media currents modified in accordance withthe signal to be transmitted, an means for translating said modifiedcurrents into audible or visual signalsf I 8. In a system for thetransmission or intelligence through the natural media, means torimpressing on the media, intermittent currents of high potential, in 00bination with means for impressing on the media currents modified inaccordance with the signal to be transmitted, and means for translatingsaid I impressing on plates in said media,

'tial, and means for impressing on modified currents into audible. i61Visual sig- 9, In a systemfor the transniissioii'of intell e: thro hheinata al m t i tmgi i f impressing on the niediaalternating currentsof high potential, in combination with means an. impressingjonthe'mediaCliilQIitSlliOClillQd in accordance w th the signal to be transmit.- ted,.and-meanstor translating said modified currents into audible or visualsignals.

j 1 0. In-asystem forthe transmission of Bspeech through the naturalmedia, means for impressing on the media currents of high potential, incombination with means for impressing on sa d media currents modifiedby.

and in accordance with sound '\'v'aves, and

.means for translating .saidmodified currents into speech,-

11. In asystem; for the transmissionot' speech through the naturalmedia, means for impressing on the media intermittent currents rentsinto speech.

'- of high potential,-,in combination. with means -.for impressing onsaid'med'ia currents modirfied by and inaccordance with SOIIIIdfVfiVQS,sand-means for translatingsaid modified cur- 12. In a system for-thetransmission of'- speech through the natural media, means for impressingon the media alternating currents of highpotential, in combination withmeans I for impressing onsaid media currents niodified by and inaccordance with sound-waves, and means for translating-said modifiedcurrents into speech.

13. Ina system for the transmission of intel;

ligence, through thenatural media, means for impressing on the media,currents ofthigh poten'tial, in combination ,with means for impressingon the media currents modified in ac ,cordance with the signal to betransmitted,-

and means for receiving the same. 14. In asystem for the transmission ofintelligence through the natural media, means for the media, currents ofhigh potential, in combination with'meansfor impressing on the mediacurrents modified in-acthe signal to be transmitted,

and a telephone: receiver for receiving said modified currents, v

15. In a system for the transmission of speech through the naturalmedia, means for impressing on the media currents of high potential, incombinationwith means for impressing on said media currents modified bycordance with and in accordance with sound-waves, and atelephone-receiver f r translating said modified currents into speech. It v 16. In a system for the transmission of intelligence through thenatural media, two metal means for impressing on currents of highpotensaid plates currents modified in accordance-with the sig-, nal tobe transmitted.

said plates electrical 17. In a system for the tra smissioi hf intelplates in said media, means for impressing on said platesintermittent currents of high potential, and means. for impressing onsaid plates currents modified in accordance with the signal to betransmitted. 4 18. A In asystem for the transmission of intelligencethrough the natural media, two metal plates in said media, means forimpressing on said plates alternating currents of high potential, andmeans for impressing on said plates currents modified in accordance withthe signal to be transmitted.

19.' In asystem for the transmission of intelligence through the naturalmedia, two metal plates in said media, means for impressing on saidplates electricai currents'of high potential, means for impressing onsaid plates currents modified in accordance with the signal to betransmitted, and two metal plates in the media at the receiving-stationand a receiver connected therewith.

20. In a system for the transmission of intelligence through the naturalmedia, two metal plates in said media, means for impressing on saidplates intermittent currents of high potential, means for impressing onsaid plates currents modified in accordance with the, signal to betransmitted, two metal plates in the media at the receiving-station, anda receiver connected to the two metal plates.

21. In a system for the transmission of intelligence through the naturalmedia, two metal plates in said media, means for impressing on saidplates currents of high potential, a source of current and means formodifying said latter current by and in accordance with the signal to betransmitted and for impressing said modified currents on said plates.

22. In asystem for the transmission of intelligence through the naturalmedia, two metal plates in said media, means for impressing on saidplates alternating currents of high potential, means for impressing onsaid plates .currents modified in accordance with the signa to betransmitted, two metal plates in the, media at the receiving-station,and areceiver connected thereto.

23. In a system tor the transmission of speech through the naturalmedia, two metal plates in said media, means for impressing on saidplates currents of high potential, a source of current and means formodifying said latter current by and in accordance with soundwaves andfor impressing said modified currents on said plates.

24. In 7 a system speech through the '0. plates in said med .ieans forimpressing on said plates intermittent currents of high potential, asource of current and means for modifying said latter current by and inaccordance with soundovares, and for impressing said modified currentson said plates.

25. In a system for the transmission of for the transmission of I zraimedia, two metal the media at the receiving-station and a receiverconnected thereto.

27. In 'a system for the transmission of speech through thenaturalmedia, two metal plates in said media, means for impressing onsaid'plates intermittentcurrents of high potential, a source of currentand means for modifying said latter current by and in accordance withsound-waves and for i npres'si g said modified currents on said'iplates,andtwof metal plates in the media at the receiving-station .and areceiver connected thereto. p

28. .In a system for the transmission of speech through the naturalmedia, two metal said metal plates alternating currents ofhighpotential, 2. source of current and meansior modifying said lattercurrent by and in accordance with sound-waves, and 't'orimiwress- .ingsaid modified currents on said-plates, and two metal plates in the mediaatthe receiving-station and a receiver connected thereto.

29. In a system for the transmission of intelligence through the naturalmedia, two metal plates in said receirer, means-for impressing on saidplates electric currents of high currents modified in accordancewith'the signal to be transmitted, and two metal plates at the 1receiving station and a receiver connected thereto, the line joiningsaid plates forming an anglewith' the 'line joining said first-mentioncd plates.

30. In a system'i'or the transmission of intelligence through thenatural media, two metal plates in'saiu media, means liorinipressing onsaid plates intermittent currents ofhigh potential, means for impressingon said plates currents modified in accordance with ,the sig nal to betransmitted, and two mctal'plates at the receiving-station and areceivcnconnected thereto, the line joining sald platcs 'forming tinnedplates. I

l 31. In ,asystem tor the trans 'ms' j;

l telligence through the natural. inc 1a,

metal plal'esin sam media, means for impress ing on said platesalternating currents of high potential, means forimpressmg on saidplates currents modified ,in accordance with the sun rents on saidplates, and two metal plates inplates in said media, means forimpressing on potential, means for impressing on said platesan anglewith the line joining i'itllflllISlwIflEll" .QIS

. nal to be transmitted, and'two marinas; at theIESOlVlflg-StflltlOHfilfld-fl IGQQlYQI' connected speechthrough thenatural medjia,'two metal plates 1n-sa1d media, means for impressingodthereto, the line, joining said. -,plates ffirming an angle with the-linj ini g Sa d first-mew, -tioned plates. 4 I

32. In a system for-lithetransmission [of said plates currentsof highpotential, :1 source I rent on said lplates andtwo inet'al plates at thereceiving station and a receiver connected thereto, the line oiningsaidplates forming;

of current and means for modifying said latv ter current, by and inaccordance with soundwaves, and for nnpressing saidmodifiedcuran anglewith the line joining said 'firstmen plates in said media, meansfor-impressing any r tioned plates.

33.111 a'system for the transmission of;

speech through thenaturalmedia, two metal." plates in said media, meansfor impressing on said plates'mtermittent currents of high potential, asource :QfrlClll'IIlij; and rfncans for modifying 'saidlatter. currentby and in ac cordance'withsound-waves, and for impress} in'g saidmodified-current on said plates, and two'metal platesatthe receivingstation and a receiver connectedtheretoathe' line joining said platesforming. an angle'with the. line joining said first-mentioned plates;

'34. In a system for'the transmission of speech through the naturalmedia, two metal said plates alternating currents offhigh tential, asource of current and means modifying said latter current by and in ac-.'cordance with sound-waves, andl for impress ing said modified current,on said plates, and

. ne'cting therefrom the other current-impresstwo metal plates at. thereceiving 'statipn and 1 a receiver connected thereto, the line oinngsaid plates formingan angle with the line joining said first-mentionedplates,

3-5. In asystem for the said plates nect ing to the plates pressing,means and 'at the same-timedrscona in'g means.

36. In a system for the transmission of in telligence through thenatural media, the combination of two metal plates in said media, meansfor impressing modified in accordance with the signal tobe sent, and aswitch 'for connectingjto' the plates one of the current-impressingmeans and at the same time disconnecting therefrom the othercurrent-impressing means. I

37. In a system. for the transmission-of speech through the naturalmedia, the comb nationof; two metal'pla'tesin saidmeuia, meanstransmission of'in telligjence through the natural media, thecombinationof two-metalplates in said media, 7 means for impressing on said DatQscur'rents of highpotential, means for impressing onl currentsnodified' in accordance with the signal to be sent, and means'foracom"vone of the current-inn v on said. plates current-s,

renton said media. n 7

forthe transmission of inmod fying said current hyjf'and in accordancewlthlsound -waves and ier, impressing, said modifiedcurrentsonsaidjplates', and means a for connect ng to the plates oneof 'thefcufl{rent impressing means and 1 simultaneously disconnecting therefrom theother currenti'mpressing means. A

38.111, a system for the transmission of 39; In a syste m fol-theanimation of intelhgence through thenatural media, the com-.

bination of a magnetogcner'atorfor impressing on said media currents ofhighpotential, a source ofcurrent, and means for modifying said currentin accordance with thesi-gnal to besent' and for impressing saidmodificdcur- 40. Inca system telligcnce through the natural medimthe coin-'bination; of a magneto-generator for ilu pressing-on sa'id mediacurrents of'high potential. asource' of current,"1 neans for modifyingsaid for said of 65 hl'gh-potentlal, a source of current,';meaus forcurrent in accordance with the signal to he sent and for impressingsaid. modified Clllltllt on'sa1d-mcd1a, and means, vfQl-flalternate1ycom necting said generator-and said last-mentioned means .tosaid media,v I

41. 11: a system forthe'transmission of intelligence throughthe-naturalmedia, the combination of a magneto-generator .for impressingon 'saidfmedia currentslof high potential,

,a source oftcurrent, :a telephonc-transmitter tor modifyingsaid currentinzaccoudanccwith modified "currents on saidme'dia, and .means 42. In asystem forzthe- ,transmissionof-im' telligencethrough thenat'ural media,the 'combination of means vfor polarizing the median andmeans forimpressing on themediacur rents. modified in accordance ,witlrthe signal.to'besent,

43'. In ysteinfor the transmissionpf intelligencethroughthe naturalmedia.

modified in accordance with 4 the si gnaPm he sent, and a receiver ata.r.lis'tantstation For receiving the same. it. In a system speechthroughthenatural media, thcjcombifor the transmission of thesignalitobe sent'and for impressing said' jfor alternatelyi connecting,. saidgenerator and 'fsaidtrans'mitter to said media the com bination of meansfor polarizing the media. *mea'ns forimpressing on the mcdn't currentsnation of means for polarizing the media, ahd

bination of a magneto-generator, means for connecting said generator tothe media, and means for short-=circ'uiting'said generator at the pointof maximum potential of thecurhigh potential may be impressed on themedia.

rent generated thereby, so that'currents of In a system for thetransmission of intelhgence through the natural media, the'eombinationof a magneto-generator, means for connectmg said generator to the media,and a spring-plate of magnetic material for short-- circuiting saidgenerator at the point of maximum potential of the current generatedthereby, so that currents of high potential may be impressed on themedia.

48. In a system for the transmission of intelligence through the naturalmedia, means for polarizing the media between the transmitting andreceiving station, said means comprising a magneto-generator havingmeans'for short-circuiting' the current generated thereby at the pointof maximum potential of said' with the ground.

current.

49. In a system for the transmission of intelligence through the naturalmedia, means for polarizing the media between the trans-- mitting andreceiving station, said 'means comprising a magneto-generator having aspring-.

plate of magnetic material for short-circuiting the current generatedthereby at the point of'maximum potential of said current.

50. In a system for the transmission of speech through the earth, thecombination of two metal plates in the. earth a magneto-generator forimpressing on said plates currents of high potential, means forshort-circuiting said generator at thepoint of maximum potential, atransmitter for impressing on the plates currents modified by and inaccordance with sound-waves, a switch for alternately connecting saidgenerator and said transmitter to the plates, and I v station sopositioned in the earth that the line joining them forms joining the twofirst-mentioned plates, and a telephone-receiver connected tosaidplates.

51. In a system, for '-speech throughthe natural media, the combinationof means for polarizinggthe media be tween the transmitting andreceivingstations and means for impressing thereon current two plates at thedistant a small angle with the line the transmission of modified by andin accordance with soundwaves. v

52: In a system forthe transmission of speech through the earth, thecombination of means for polarizing the earth between the transmittingand receiving stations, and means for impressing thereon currentsmodified by and in'accordance with sound-waves.

53. In an apparatus Iof the characterdescribed, the combination of meansfor preparing the earth so-that undulatory waves'can be generating saidundulatory waves. a v

54:. In an' apparatus of the character described, the combination ofmeans for preparing the natural media, ,i so that undulatory waves canbe transmitted through the natural tory waves. a

55. In a system of telephony, the combinationof two ground connectionsand atransmitting instrument connected therewith, a receiver having twoground connections, and means toimpress on the ground at the transmittercurrents of, high potential, and means for impressing on saidplateslcurrents. modified by and in accordance with sound-waves.

56. In a system of wireless telephony, a transmitter 'and a receiver,each having two ground connections, a' magneto-generator connected tothe transmitters ground connections connections, andmeans'to cut themagnetogenerator irom connection wlth the ground .connections when thetransmitter 1s connected '57. In a system of wireless telephony havingtwo ground connections at the transmitting and receiving stations,amagneto-generator connected to the ground connections of thetransmitting-station to impress ahighrpotential current uponflsaidconnections, a transmitter, and means-to disconnect the generator fromthe ground connections when the transmitter is connected to the groundconnections.

58. In a transmitter, the combinationof two ground connections, means tomake a' signal and means to establish an electrical circuit, said meanscomprising apair of supportingplates, a field-magnet surrounding thesame, a revolving armature mounted between the said supportingplates, aspring-plate suspended above the supporting-plates and armature, andelectrical connections between the armature and one connection of thetransmitter and'between the spring-plate, magnet and the otherconnection of the transmitter,

'59; In a signaling system, the combination of a transmitterwhiQllpgmprises two connections with the natur l media, means to producea signal, and. means to impress a tial currentv upon means. comprisingamagneto-machine, whose l armature is adaptedtobe revolved, and meansmedia and means for generating said undula- I to impress ahigh-potential current on said high-potenthe natural media, 321d:

transmitted through the earth'and means for E mri' eireuit the armaturefor automatically "hm king the circuit when the current-is at itsnmximum.

60. In transmitter apparatus for transmitting intelligence throughnatural medium or media, means foi' impressing high-potential :t -iimpulses thereupon, and means for quitting an undulatory variation incorrespomieuee with speech, fer-substantially the purposes set forth. v

In testunony whereoflafix my slgnature 1n presence of two -w1tnesses.-

DANIEL DRAWBAUGH.

Witnesses:

SAMUEL DrHom z, FRANKLIN S; HERTZLER.

